"It was really hot in Santa Cruz, so I went down to Natural Bridges Beach. About 5 minutes after I sat down, the sky got dark, the wind picked up, and a huge fog cloud rolled in fast. Umbrellas were flying, sand was pelting me in the face and people were quickly leaving the beach. After only a few minutes, the fog cloud passed and the sun came out," the author of the video wrote.
Youtube viewers seemed to be also amazed with the epic footage.
"It's the end of the world," one of the commentators wrote, with another one suggesting that "there's an alien spaceship inside that dense cloud."